haskins



(ModeL) 2 Sheets-Sheet 1. G. D. HASKINS. Telephone Call.

N9. 234,772. Patented Nov. 23,1880.

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(ModeL) 0. D. HASKIN S. Telephone Call.

No. 234,772. Patented Nov.'23, 1880.

' N. PETERS, FHOTO-UTHOGRAP ATENT Marcia.

CHARLES D. HASKINS, OF NEW YORK, N. Y.

TELEPHONE-CALL.

SPECIFICATION forming part of Letters Patent No. 234,772, dated November 23, 1880,

Application filed September 20, 1880. (Model.)

To all whom it may concern Be it known that I, CHARLES D. HASKINS, of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Telephone-Calls and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to electric calls or signals especially adapted for use on telephonecircuits, though suitable for other purposes. Its object is to enable signals to be exchanged between a central office and any station on a given circuit without operating the signal or call of any other station on the same circuit; and to this end it consists in the combination, witheach of a series of electric bells or other electric apparatus and a main circuit, of a shunting mechanism adapted to be operated by an electric current passing over said main circuit, for bringing any one of said series of bells or other apparatus directly in the main circuit or shunting it therefrom, as desired, all as more fully hereinafter explained and described, thus, in the case of a series of signal-bells in a telephonic circuit, enabling the bell at any particular station to be run g without afi'ectin g the bells at other stations. I thus abate what has grown to be a serious nuisance in connection with telephonic communication-namely, the annoyance of all the subscribers on a circuit by the ringing of their bells when they are not wanted.

My invention also consists in a novel shunting apparatus adapted for use in connection with an electric bell or other electric apparatus and an electric circuit, whereby said bell or other electrical apparatus may, by means of a current passing overthe circuit, be brought into or shunted from the circuit, as desired.

In the accompanying drawings, Figure 1 i'sa perspective view of myimproved apparatus in connection with an electric bell. Fig. 2 is a perspective view of the apparatus in a different position, and Fig. 3 is a detached view of parts in detail.

The letter .A designates a polarized electromagnet, similar in construction to what is a ratchet-wheel, D.

known as the Siemens polarized relay, m m being the coils surrounding soft-iron cores, connected in the usual manner and provided with inwardly-extending soft-iron poles p p.

n is the permanent polarizing-magnet, and o the vibratory soft-iron armature or tongue, polarized by induction from steel magnet 12, which plays between the poles p p, and has its lower end fixed to an arbor, q, mounted in metallic bearings 1, which are arranged upon the permanent magnet n. The tongue 0 has a porlongation, non-magnetic, preferably of brass, which extends some distance above the coils and terminates in a rearwardly-projecting stud, 0.

The letter B indicates a disk fixed to a sleeve which is mounted on a stud projecting from the metallic plate 0, and to this same sleeveis fixed (Shown in dotted lines, Fig.1.) The disk B has cut through it an aperture, b, and said disk is so located as to be in the path of the upper end of the non-magnetic portion of the vibratory tongue 0 and its stud 0, so that said tongue cannot make its full movement toward the soft-iron pole 19 except when aperture 12 of the disk coincides with the stud 0, so that said stud can pass through it. To bring the aperture into or to remove it from coincidence with the stud the disk is turned by the operation of an impelling-paw], f, upon the ratchet-wheel I), this impellingpawl being pivoted to the top of an arm, F, the lower end of which is fixed to a polarized steel armature, G, formed in the shape of a horseshoe, and so pivoted about midway its length to the arm H projecting from the plate 0 that its poles stand directly in frontof the soft-iron poles p p of the polarized electro-magnet. When the armature G is attracted by the magnet the arm F and its pawlf cause the ratchet-wheel D to move in the usual manner, one tooth at a time, a retractile spring, 5, withdrawing the armature from the magnet when the influence of the latter ceases. A stop,f., fixed to the arm F, prevents the ratchet-wheel from moving more than the length of one tooth each time, and a detent, f, prevents a retrograde movement.

Some distance below its top the tongue 0 has fixed to it an elastic metallic arm, J, projecting rearwardly, and having a transverse ridge or bead,j, formed on it near its end, said ridge having its sides inclined.

To the plate 0 is fixed a block, K, of insulatin g material, preferably hard rubber, and to the frontface of this block is fixed a metallic plate, I, the block K projecting to such an extent and the plate 1 having such a thickness that when the stud 0 of the tongue 0 projects through the aperture 1) of the disk B the spring-arm J will be carried toward the plate G such a distance that the ridge or head j will be in contact with the end of said insulating-block and prevent the metallic spring-arm from coming in contact with the metal plate 1; but when the stud 0 of the vibratory tongue 0 is withdrawn from the aperture of the disk either the ridgej or the tip of the arm beyond said ridge will be pressed upon the end of the metallic plate 1.

One terminal of the coils m m connects with a bindingscrew, L, with which is also connected the main line, and the other terminal connects with the right-angled extension 0 of the metal plate 0, to which the permanent magnet n is fixed in close metallic contact. This terminal of the coils might, however, connect directly with the arm J, or with any point of the frame-work or parts bet-ween said arm and the terminal connection, as shown, provided electrical connection with the arm is preserved.

A wire, it, connects the metal plate 1 with a binding-screw, L, and with this screw also connects the main line, leading in an opposite direction from that in which the line leads from screw L; and L is a binding-screw in electrical connection with plate 0 through awire, u.

The letter V indicates an electric call-bell of ordinary construction, having its coils connected with the binding-screws L L by wires '12 o.

The steel polarized armature Gr has its poles so arranged that an electrical current through the coils m m having a polarity (or direction) to cause the soft-iron tongue 0 to move toward the pole 19 will also cause the poles p p to attract said arrnature G, and from this it follows that said armature will be repelled and fallback with the assistance of its retraotile spring when a current is passing through the coils m m, which will cause the tongue 0 to move toward pole p.

The operation of the apparatus as now described is as follows: Each subscribers station on the circuit is provided with the instrument and an electric signal, connected together and to the main line, substantially as shown. The aperture 1) of the disk B in each instrument is set in different position with relation to the stud 0 from that of the apertures of all the other instruments, so that at only one instrument can the tongue 0 perform its full movement toward pole p at a time. In other words, supposing that a circuit of six stations had just been completed, the disks would be so arranged or set that at none of the stations would the aperture of the disk and the stud 0 coincide or be in line. But

now, for example, let us say that four vibrations of the arm F will cause pawl fto move ratchet-wheel D four teeth and bring apertures b opposite and ready to receive stud 0 at the first station, it should require the movement of the ratchet a greater number of teeth to produce the coincidence at the second station-say eight teethand for the third station a still greater number, and so on. Now, the operator at the central office has his battery connected with the line, and by means of a suitable key he can send over the line the proper number of electrical impulses to cause the disk at any desired station to move to bring its aperture to proper position to receive the stud 0, and in so placing the instrument at any station in position to receive a call the operator should have the polarity or direction of his battery-current so arranged that it will also cause the tongue 0 to move toward pole p, and then the plug 0 will not engage with the disks at stations not intended to be called; but on the polarity bein g reversed it will complete its full movement and the spring-arm J will be carried rearward. so that contact between it and plate 1 will be broken, and the ridgej will bear upon the end of the insulating-block K. The direction of a current then passing from the main line to the instrument, as indicated by the arrow at the left, would be through the coils, metallic plate G O, and wire at to the call-bell circuit, through said circuit and bell to binding-screw L, and thence off on the main line, and each separate impulse will cause the hell to be sounded, the proper number being sent to call the station. In fact, the ringing of the bell at all at a station is sufficient to show that is the station wanted, as the bell only rings at the station which is desired to be communicated with. In all the other stations the aperture of the disk will be out of coincidence with the stud 0 of the vibratory tongue, and consequently in each said tongue will hold its elastic metallic arm J so that its end or ridge j will rest upon the end of metallic plate Z, and in each of these uncalled stations the current will flow from the main line through the coils, plate 0, permanent magnet 02, arbor q and its metallic bearin gs, tongue 0, arm J, plate I, and wire t to post L, and thence off on the main line, thus taking the shortest route from bindin g-screw L to binding-screw L and avoiding the electric-bell circuit, said bell consequently remaining unrung and the subscriber unannoyed by a sounding-signal in which he has no interest. v

By simply keeping a memorandum of the last station called the operator will, of course, know at the central office how many impulses are necessary to call any other, or rather to place the instrument at any station in position to permit a call. The call should be sounded by electrical impulses of the same polarity as required to move tongue 0 toward pole p, in order that said tongue may be maintained in proper position to keep the bell-circuit switched on the line. When the line is not in use the battery-current should be left on with a polarity to cause the tongue to move toward pole 11, so that armature G will be repelled and held away from the poles p as before explained, and consequently when from any station a call is made for the central office none of the other instruments in the circuit will be IO affected.

It is obvious that many modifications of the apparatus now described may be made Without departing from the principle of my invention. For instance,in lieu of the retractile spring for 1 drawing back the armatureGrand arm F, there maybe used an electro-magnet having its poles arranged opposite those of coils m m and sufficiently near the poles of armature G, in a well-known manner. It will be obvious, also,

that the plate 0 C may be dispensed with and a wooden support for the instrument be used,

provided proper metallic connections be established for the current to pass overin the directions heretofore indicated.

2 5 Any other electrical apparatus may be used in connection with the shunting-instrument besides electrical bells where there are a series of such apparatus in a circuit and it is desired to operate them singly.

0 Instead of using a polarized electro-magnet the cores of which are polarized by induction from a permanent magnet, I may use what is known as a neutral magnet, discarding the permanent inducin gm agnet and polarizing the 3 5 vibratory tongue-armature, which should be so arranged that one of its poles plays between the poles of the neutral electro-magnet, the extra armature and all other parts and the manipulation of the battery-current remaining, as heretofore described, in connection with the polarized electro-magnet.

What I claim is 1. The combination, with an electro-magnet having a vibratory tongue-armature playing between its poles and a main line and local or bell circuit, of a shunting device connected with or adapted to be operated by said ton guearmature, an extra armature operated by said electro-magnet, and a movable stop operated by said extra armature to control the move- 0 ment of said tongue-armature and shunting device, substantially as described, whereby the local or hell circuit may be brought into the main circuit or shunted therefrom by means of an electric current passing over said main line.

2. The combination of the polarized electromagnet, the vibratory tongue-armature 0,having projecting stud 0, the disk B, having the aperture I), the extra armature G, and suita- 6o ble intermediate mechanism by which motion may be communicated from said extra armature to said disk, and a shunting device or devices arranged to be operated by said vibratory tongue-armature, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 29th day of December, 1879.

CHARLES DARWIN HASKINS. WVitnesses:

FRANK L. Porn, WM. ARNOUX. 

